Sharpener for endless band blade bread slicing machine



April 11, 1961 K. VISNAW 2,978,849

SHARPENER FOR ENDLESS BAND BLADE BREAD SLICING MACHINE Filed Sept. 22, 1959 6 Sheets-Sheet 1 FIG. I

INVENTOR.

KENNETH VI SNAW ATTORNEYS April 11, 1961 K. VISNAW 2, 4

SHARPENER FOR ENDLESS BAND BLADE BREAD SLICING MACHINE Filed Sept. 22, 1959 6 Sheets-Sheet 2 ,2 FIG. 2 30 '7 23 65 FIG. 3

INVENTOR. KENNETH VlSgAW RBYWF ATTORNEYS April 11, 1961 K. VlSNAW 2,978,849

SHARPENER FOR ENDLESS BAND BLADE BREAD sucme MACHINE Filed Sept. 22, 1959 e Sheets-Sheet s LO I LO 5 I PO q- P? LO (Q m q- (\l a m g l (g i m i 9 & lllllllllll IN VEN TOR.

KENNETH ISNAW '1 l 3 i I I I I Q ATTORNEYS April 11, 1961 K. VISNAW 2,978,849

SHARPENER FOR ENDLESS BAND BLADE BREAD sucmc MACHINE Filed Sept. 22, 1959 6 Sheets-Sheet 4 INVENTOR.

KEN NETH VISNAW W ATTORNEYS April 11, 1961 K. VISNAW 2, 7 8

SHARPENER FOR ENDLESS BAND BLADE BREAD SLICING MACHINE Filed Sept. 22, 1959 6 Sheets-Sheet 5 FIG. 6

IN VEN TOR.

KENNETH Vl% ATTOR N EYS April 11, 1961 K. VlSNAW 2,978,849

SHARPENER FOR ENDLESS BAND BLADE BREAD SLICING MACHINE Filed Sept. 22, 1959 6 Sheets-Sheet B 1 KENNETH VISNAW BY M ATTORN EYS aqsitio s f apar ment-l tia naa slis-i a SHARPENER FOR ENDLESS BAND-BLADE BREAD SLICING MACHINE t Kenneth Visnaw, Saginaw, Mich., assignor to Bettendori Bakery Equiprnent Co., Bettendorf, Iowa, a corporation of Iowa Filed Sept. 22, 1959, Ser. No. 841,511.

11 Claims. -(Cl. 51-247) This invention relates to a honing or sharpening device for slicing machines of the type having a plurality of endless slicing bands turning on and reaching between upper and lower drums, the two reaches of each band between the drums each having a twist of 180?. There may be one or more upper drums and one or more lower drums, and the 180 total twist of each reach may be all in the same direction, or may be 90* in one direction of twist and then 90 in the opposite direction of twist.

The invention contemplates the provision of a sharpener assembly which is substantially self-contained and may be readily mounted in association with the base frame of a bread slicing machine to sharpen one side of each blade. It will usually be desirable to provide two of the devices contemplated by the invention at ditferent locations in association with the base frame in order to pro vide for sharpening of both sides of each blade. Theinvention contemplates the provision of a cylindrical abrasive member carried on a sharpener carriage andrnounted for continuous rotation relative thereto but adapted to be oscillated into and out of blade-engaging condition by bodily movement together with the sharpener carriage and further adapted to be bodily reciprocated backand forth together with the sharpener carriaga motor means being provided in driving association with the cylin d rical abrading' member and with a linkage for reciprocating the sharpener carriage. i

A subsidiary object of the invention is to provide the above organization of elements in association with means for controlling the motion of.the abrading member as it t is moved into contact with the blades to besharpened in a manner which will appear more fullybelow.

A generai object of the invention is to provide a blade sharpener device ofthe general class described which is inexpensive to manufacture and is eif ective, efiicient and reliable in operation,

These and other objects and advantages ofthe invention will appear more fully from the following description of an example of the invention taken togetherwith the accompanying drawings, in which: V

Figure 1 is a side elevation of a band blade bread slicing machine in which theinvention is employed: Figures 2 and 3 -are enlarged viewsshowirlgyrespec tively, the upper right and lower left portions of Figure 1. Figure 4 is a fragmentary 'view taken from theplane of line 4-4 in Figure 2.

Figure 5 is a perspective view of a sharpener carriage assembly and associated stationary shaft employed .in the illustrated example, of

the invention and also seen in part in Figures 2-4. h

Figure 6 isa fragmentary,crossisection of the cylindrical abrading member, and associated bearing structure shown in Figure. 5,

Figure 7 is an end view of the apparatusasseen in i u 7 t u e s a; a ent r ine 78 n Fi ure? andii h g Patented Apr. 11, 1961 Shown in Figure 1 is a sideelevatipn of a conventional endless bladetype bread slicing machine including a base frame generallytindicated by the reference numeral 10, a first drum 11 atfltheupper portion of theapparatus, and a second drum 12 at the lower portion of the apparatus. Each of the drums v11 and ,12 is rotatably mounted on the base frame 10. The drumgl2 is powered from a suitable motor 13. A pluralityof endless slicing blades 14 turn on and reach between the'drums 11 and 12 in a well-known manner. Each of the, slicing blades 14 has first and second'reaches, 15 and 16. respectively, which extend from a position in 'cohtact'lwi'th and tangent to the first drum 11 to a position in ccntactwith and tangent to the second drum 12 Each of the first and second reaches has a twistof therein. Each reach is guided by a pairof guide fingers 17 and 18 in swell-known manner sothat the portion of, the reach extending between the guide fingers 17 and Ji -includes substantially no twist, the majority of the twist therefore occurring between the roll 11 and the guide finger 17 or the roll 12 and the guide finger 18. All this is well known.

According to the invention, there may be provided sharpeherassemblies mounted in the manner described below' on the base frame 10, each sharpener assembly being provided with sharpening apparatus adapted to be brought into sharpening association with one side of each of the bands '1 at the cutting edges thereof. The locations of these sharpener 'assmblies are indicated diagrammatically in Figurel by the reference numerals 21 and 22. The sharpener assemblies' td be positioned at 21 and 22 are illustrated on smal scale in Figures 2 "and 3, respectively. In Figure 2, such "apparatus is generally indicated by the reference numeral '23; and in Figure 3, by thereference numeral 24.

The sharpening assemblies illustrated in Figures 2 and 3 are substantially identicaland e'ach comprises a sharpener carriage 30, a cylindrical abrading member 31, a stationary mounteclshaft'32, and a numberoi other identical or equivalent elements. Since the sharpener apparatus of Figures 2 and 3 aresubstantiallyidentical, the remain der of this description will concern itself only with the description of the apparatus seen in Figure 2, it being understood that such description will also serve to describe the apparatus of Figure 3.

The sharpener carriage 30 in Lthe illustrated assembly comprises a sl eve portion 33 which is received for sliding and oscillating motiononthe stationary shaft 32. The stationary shaft 32 i is received in suitable mounting brackets 34 which are bolted to the base frame 10. The

cylindrical abrading member 31 comprises a plurality of cylindrical segments 36'receivedl on a shaft 37, the reduced ends of which are rotatably'lrnounted in end hearing assemblies 38"'(see Figures 5'jand6).. Each end bearing assembly 38 isbolted to thetieiplate 3 9 which is afiixed to the sleevef33. 'A' sheave dtl is in driving association with theshaft; 37.

It will be seen' that the cylindrical abrading member 31 is, in fact, rotatably moiintedoii -the sharpener carriage 36 for reciprocation and oscillation bodily therewith, and

is rotatable relative thereto about an axis parallel to Lhe stationary shaft32, thatQis; parallel to the direction of reciprocation or" the sharpener carriage. It will be seen that the pscillatorymotiii of the abrading member 31 as it moveslliodily with thesharperjer carriage accomplishes movemen thf the abrading niernberjiii into'andout of engagement with the blades," One oi theflreaches 16 tofone v ital atisp e assess s??? s e he ve Plant of the reach 16 at the portion thereof adjacent the abrading member 31. This angle might be typically about seven degrees. g

In the illustrated apparatus, a pair of spaced guide plates 46 and 47 are fixed to the stationary shaft 32 and have apposite guiding faces normal to the stationary shaft. A- drive shaft 48 is mounted on the sharpener carriage 30 in the manner illustrated most clearly in Figure 5. The drive shaft 48 extends radially outwardly with respect to the stationary shaft 32. An eccentric wheel 49 is mounted eccentrically on the drive shaft 48 and is engaged between the guiding faces of the guide plates 46 and 47. It will be seen that this linkage accomplishes reciprocation of the sleeve 33 on the shaft 32 by a mechanical relationship which is independent of oscillatory movement of the sharpener carriage 30 and abrading member 31 about the stationary shaft 32.

Motor means is provided in driving association with the cylindrical abrading member 31 for powering the rotation thereof relative to the sharpener carriage 30 and also in driving association with the carriage reciprocating linkage means including in the illustrated embodiment the eccentric wheel 49 and drive shaft 48. In the illustrated embodiment a motor 55 is carried bodily on the sharpener carriage 30 and drives the sheave 40 through a belt 56. The other end of the shaft .of the motor 55 powers the drive shaft 48 through a suitable speed reducing linkage including the worm 57 and spur 58.

Yielding means is provided which normally biases the sharpener carriage 30 at oscillatory positioning of the abrading member out of contact with the blades. In the illustrated embodiment this means comprises a spring 60 which biases a head or abutment 61 upwardly as viewed in Figure 4. Actually, the oscillatory positioning of the abrading member 31 as seen in Figure 4 is even further away from the blade reach 16 than the position imposed by the spring 60, since in this particular view the carriage 30 and particularly the bearing assembly 38 and tie plate 39 are shown as being out of contact entirely with the member 61. This relationship results, for example, if the center of gravity of the sharpener assembly 23 as seen in Figure 2 is such that it tends to maintain itself at a leftmost oscillatory position as seen in Figure 2 due to the center of gravity being located to the left of the center of the shaft 32. It will be understood, however, that even if this is not the case, the spring 60 and abutment 61 act against the underside of the members 38 and 39 to normally hold the abrading member 31 out of engagement with the blade reach 16.

The oscillatory position of the sharpener carriage 30 and abrading member '31 may be fixed by suitable handle means conventionally extending sidewise outwardly past the side of the base frame 10. As illustrated, the handle may comprise merely a bent plate or rod 65 bolted to one of'the-bearing assemblies 38.

The spring 60 and abutment member 61 are based on a fixed tie member 66 whichmay be bolted to the base frame 10, as-seen most clearly in Figure 4. If the handle 65 is manipulated in such a manner as to bring the abrading member too rapidly into contact with the reach 16, damage or injury, including dangerous break-.

age of the blade 14, may result. To this end the velocity of movement of the stem 69 carrying the abutment 61 is limited, at least in the downward direction as viewed in Figure 4, by asuitable device, such as a dashpot 68 or other velocity limiting means.

Suitable adjustment means such as the nutslll and 72 in association with a threaded stem 73 rnay bjef'provided to 'adjustthe datum position of the assembly'including the'spring60, abutment member 61, and dashpot 68 The operation of the illustrated apparatus is as 'follows. When it is desired to sharpen blades, whichmay be at intervals of some several hours or several days,- the handle 65 associated with the upper sharpener assembly ispushed downwardly to theleft as seen in Figure-2 to'b'ring'the associated abrading member 31 slowly into contact with one side of the cutting edge of the array of band blades, this movement being relatively lightly opposed by the spring 60 and the velocity of this movement being limited by the dashpot 68. The handle 65 is thereupon moved upwardly and to the right as seen in Figure 2 or is simply released to bring the abradsharpener assembly through several cycles, or to actuate is independent of said oscillatory'movement of said sharp one several times in succession and then actuate the other several times in succession.

The invention is not restricted to the slavish imitation of each and every one of the details described above which have been set forth merely by way of example with the intent of most clearly setting forth the teaching of the invention. Obviously devices may be provided which change, eliminate or add certain specific structural details without departing from the invention.

What is claimed is: I

1. The combination with a base frame, first and second parallel, spaced-apart drum means rotatably mounted on said base frame, and endless slicing bands turning on and reaching between said first and second drum means,

:said slicing bands each having a cutting edge and said slicing bands each having first and second reaches both of which extend from a position in contact with and tangent to said first drum means to a position in contact with and tangent to said second drum means, and each of said first and second reaches having a twist of 180 degrees therein, of a stationary shaft on said base frame extending parallel to the axes of said drum means, a sharpener carriage having a sleeve portion received for sliding and oscillating motion on said stationary shaft, a

. cylindrical abrading member rotatably mountedon saidsharpener carriage for reciprocation and oscillation bodily therewith and for rotation relative thereto about an axis parallel to said stationary shaft, said oscillatory motion of said abrading member bodily with said sharpener carriage accomplishing movement of said abrading member into and out of engagement with one side of one edge of said bands, spaced guide plates fixed to said stationary shaft and having apposite guiding faces normal to said stationary shaft, a drive shaft mounted on said sharpener carriage and extending radially outwardly with respect to said stationary shaft, an eccentric wheel eccentrically mounted on said drive shaft and engaged between said guiding faces for accomplishing reciprocation of said sleeve on said shaft by a mechanical relationship which ener carriage about said stationary shaft, motor means carried bodily on said sharpener carriage and in driving association with said cylindrical abrading member for powering the rotation thereof relative to said sharpener carriage and in driving association with said drive shaft,

' yielding means normally biasing s-aid sharpener carriage.

for oscillatory positioning of said abrading member out of contact with said blades, means limiting the angular velocity of said oscillatory movement of said abrading member into contact with said' blades, said two last-named means including an abutment shaft positioned for engagement by said sharpener carriage toward the one limit ofoscillatory movement of the carriage relative to said sharpener carriage which corresponds to engagement of 7 said abrading member with said bands, spring meansbiasing said abutment shaft to yieldingly oppose displacement upon engagement by said carriage, and a dashpot limiting the rate of displacement of said shaft against the biasing of said spring.

said base frame, and endless slicing bands turning on and reaching between'said first and second drum means, said slicing bands each having acutting edge andsaid slicing bands each having firstland second reaches both of which extend from a position in'contact with and tangent to said first drum means to a position in contact with and tangent to said second drum means, and each of said first and second reaches having a twist of 180 degrees therein, of: a first sharpener assembly including a sharpener car'- riage, means mounting said sharpener carriage on 'said base frame for reciprocation in 'a given direction transversely of said bands and for oscillation in planes normal to said direction, said given direction being parallel to the axes of said drum means, a cylindrical abrading member rotatably mounted on said sharpener carriage for reciprocation and oscillation bodily therewith-and for rotation relative thereto about an axis parallel to said given direction, said oscillatory motion of said abrading member bodily with said sharpener carriage accomplishing movement of said abrading member 'into and out of engagement with one side of one edge of said bands, linkage, means for reciprocating said sharpener carriage, motor means in driving association with said cylindrical abrading member for powering the rotation thereof relative to said sharpener carriage and in driving association with said carriage-reciprocating linkage means for actuation thereof, a second sharpener assembly including a second sharpener carriage, means for mounting said second sharpener assemblyon said base frame for reciprocation in a given direction transverse of said bands and for oscillation in planes normal to said direction, said given direction being parallel to the axes of said drum means, a second cylindrical abrading member rotatably mounted in said second sharpener carriagefor reciprocation and oscillation bodily therewith and for rotation relative thereto about an axis parallel to said given direction, said oscillatory motion of said Jabrading member bodily with said second sharpener,carriage'accomplishing movement of said second abrading member into and out of engagement with the aforesaid one edge of said bands on the side thereof other than the aforesaid one side, second linkage means for reciprocatingsaid second sharpener carriage, motor means in driving association with said second cylindrical abrading memberfor powering the rotation thereof relative to, said second sharpener carriage and in driving association with said second carriage reciprocating linkage means for actuation thereof.

3. The combination with a base frame, first and second parallel, spaced-apart drum means rotatably mounted on said base frame, and endless slicing bands turning on and reaching between said first and second drummeans, said slicing bands each having a cutting edge and said slicingbands each'having first and second reaches both of which extend from a position in contact with and tangent to said first drum means to a position in contact -With and, tangent to said second drum means, and each of said first and second reaches having a twist of 180,

degrees therein, of: a stationary shaft on said base frame extending parallel to the axesof said drum means,1;a sharpener carriage having a sleeve portion received for sliding and oscillating motion on said stationary shaft, a cylindrical abrading member, rotatably mounted on said sharpener carriage for reciprocation and oscillation bodily therewith, and for rotati'on relativethereto about an axis paralleltosaid stationary shaft, said oscillatory motion ofvsaid abrading member bodily with said sharpener car- 'riage accomplishing movementof said abrading member intoandout'of engagement with one side of one edge of said bands, linkage means for reciprocatably sliding said sharpener carriage back and forth on said" shaft, motor means carriedbodily on, said sharpenerfcarriage and in 1- driving association'with said cylindrical abrading member forpowering the rotation thereof relativeto said sharpener carriage and in driving association with said carriagereciprocating linkage means for actuation thereof.

i 4..The combination withpa base frame, first andseco nd ,parellel, spaced-apart drumfmeans rotatably mounted on, saidfbase'frame, and endless slicing bands turning on and 5 reaching between said; first and second drum means, said slicing bands each having a cutting edge and said slicing bands each having first and second reaches both of which extend from a position in contact with and tangent to said first drum means to a position in contact with and tangent to said second drum means, and each of said first and second reaches having a twist of degrees therein, of: a sharpener carriage, means mounting said sharpener carriage on said, base frame for reciprocation in a given direction transversely of said bands and for oscillation in planes normal to said direction, said given direction being parallel to the axes of said drumtrneans, a cylindrical, abrading member rotatably mounted on said sharpener carriage for reciprocation and oscillation bodily therewith and for rotation relative theretoabout an axis parallel to said givendirection, said oscillatory motion of said abrading member bodily with said sharpener carriage accomplishing movement of said abrading member into and out of engagement with one side of one edge of said bands, linkage means for reciprocating said sharpener carriage, motor means in driving association with said cylindrical abrading member for powering the rotation thereof relative to said sharpener carriage and in driving association with said carriage-reciprocating linkage means for actuation thereof, yielding means normally biasing said sharpener carriage for oscillatory positioning of said abrading mem- "ber out of contact with saidblades. it

5. The combination with a base frame, first and secondparallehspaced-apart drum means rotatably mounted on said base frame, and endless slicing bands turning on and reaching between said first and second drum means, said slicing bands each having a cutting edge and said slicing bands each having first and second reaches both of which extend from a position in contact and tangent to said first drum means to a position in contact with and tangent to said second drum means, and each of said first and second reaches having a twist of 180 degrees'therein, of: a stationary shaft on said base frame extending parallel to the axes of said drum means, a sharpener carriage having a sleeve portion received for sliding and oscillating motion on said stationary shaft, a cylindrical abrading member rotatably mounted on said sharpener carriage for reciprocation and oscillation bodily therewith and for rotation ,relative thereto about an axis parallelrto said stationary shaft, said oscillatory motion of said abrading member bodily withsaid sharpener carriage accomplishing movement of said abrading member into and Qutof engagement with one side of one edge ofzsaid bands, linkage means for reciprocatably sliding said sharpener carriage back and forth on said shaft, motor means carried bodily on said' sharpener carriage and in driving association with said cylindricalabrading member for powering the rotation thereof. relative to said sharpener carriageand in" driving associationwith'said carriage-reciprocating,link- 'ageameans for't'actuation thereof; yielding means ,nor-

' 'mallybiasing said-sharpener carriage for, oscillatory ,po

sitioning of said abrading member out of contact with said blades. p

6. Thecombination with a .base frame, first and second parallehspaced-apart drum means rotatably mount- -ed on said'base frame, and endless slicingf bands turning on sand reaching between said first and second drum means, saidislicing .bands each having a cutting edge in contact with and tangent to said second'drum means,

andjeachof said;,first,a11dsecond reaches having a twist of ldQ-degrees ,thereiinofz a sharpener carriage, means mountingsaid sharpenerearriage on, said base framefor reciprocation in a given direction transverselybf saidbands and 'fon oscillation planesmormal ito said direction, s'aidgivenfdirec'tion being parallel toftlie 'axes or said drum means, a cylindricalabrading member rotatably mounted on said sharpener carriage for reciprocation and oscillation bodily therewith and for rotation relative thereto-about an axis parallel to said given direction, said oscillatory motion of said abrading member bodily with said sharpener carriage accomplishing movement of said abrading member into and out of engagement with one side of one edge of said bands, linkage means for reciprocating said sharpener carriage, motor means in driving association with said cylindrical abrading member for powering the rotation thereof relative to said sharpener carriage and in driving association with said carriage-reciprocating linkage means foractuation thereof, yielding means normally biasing said sharpener carriage for oscillatory positioning of said abrading memberout of contact with said blades, means limiting the angular velocity-of said oscillatory movement of said abrading member into contact with said blades, said two last-named means including an abutment shaft positioned for engagement by said sharpener carriage toward the one limit of oscillatory movement of the carriage rela-v tive to said sharpener carriage which corresponds to engagement of said abrading member with said bands, spring means biasing said abutment shaft to yieldingly oppose displacement upon engagement by said carriage, and a dashpot limiting the rate of displacement of said shaft against the biasing of said spring.

7. The combination with a base frame, first and second parallel, spaced-apart drum means rotatably mounted on said base frame, and endless slicing bands turning on and reaching between said first and second drum means, said slicing bands each having a cutting edge and said slicing bands each having first and second reaches both of which extend from a position in contact with and tangent to said first drum means to a position in contact with and tangent to said second drum means, and each of-said first and second reaches having a twist of 180 degrees therein, of: a sharpener carriage, means mounting said sharpener carriage on said base frame for reciprocation in a given direction transversely of said bands and for oscillation in planes normal to said direction, said given direction being parallel 'to the axes of said drum means, a cylindrical abrading member rotatably-mounted on said sharpener'carriage for reciprocation and oscillation bodily therewith and for rotation relative thereto about an axis parallel to said given direction, said oscillatory motion of said abrading member bodily with said sharpener carriage. accomplishing movementof said abrading member into and out of engagement with one side of' oneiedge of said bands, linkage means'for reciprocating said sharpener carriage, motor means in'driving association with said cylindrical abrading memberfor powering the rotation thereof relative tosaid sharpener carriage and in driving association with said carriage-reciprocating linkage means foractuation thereof. s ,1

8. The combination with a base frame, first andsecond parallel, spaced-apartdrum means rotatably mounted on said base frame, and endless slicing bandsturning onand and tangent to said second drum means, and each of said 1 first and second reaches having a twist of 180 degrees therein, of: a stationary shaft on; said base frame extending parallel to the axes of said drum means, a sharpener carriage having a sleeve portion received for sliding and oscillating motion on said stationary shaft, a cylindrical abrading member rotatably mounted onsaid sharpener carriage for reciprocation and oscillation bodily therewith f and forrotation relative thereto about an'axis parallel to said: stationary ios cillatpry motion of said abrading member bodily with said sharpener carriage accomplishing movement of said abrading member into and out of'engagement with one side'of one edge of said bands,lspaced guide platesfixed to said stationary shaft and having apposite guiding faces normal to said stationary shaft, a drive shaft mounted on said sharpener carriage and extending radially outwardly with respect to said stationary shaft, an eccentric wheel eccentrically mounted on said drive shaft and engaged between said guiding faces for accomplishing reciprocation of said sleeve on said shaft by a mechanical relationship which is independent of said oscillatory, movement of said sharpener carriage about said stationary shaft, motor means carried bodily onsaid sharpener carriage and in driving association with said cylindrical abrading member for powering the rotation thereof relative to saidtsharpener carriage and in driving association with said drive shaft, yielding means i normally biasing said sharpener carriage for oscillatory positioning of said abrading member out of contact with said blades, means 'limiting'the angular velocity of said oscillatory movement of said abrading member into contact with said blades.

9. The combination with a base frame, first and second parallel, spaced-apart drum means rotatably mounted on said base frame, and endless slicing bands turning on and reaching between said first and second drum means,'said slicing bands each having a cutting edge and said slicing bands each having first and second reaches both of which extend from a position in contact with and tangent to said first drum means to a position in contact with and tangent to said second drum means, and each of said first and second reaches having a twist of 180 degrees therein, of: a stationary shaft on said base frame extending parallel to the axes of said drum' means, a sharpener carriage having a sleeve portion received for sliding and oscillating motion on said stationary shaftja cylindrical abrading member rotatably mounted on said sharpener carriage for reciprocation and oscillation bodily therewith and for rotation relative thereto about an axis parallel to said stationary shaft, said oscillatory motion of said abrading member bodily with said sharpener carriage accomplishing movement of said abrading member into and out of engagement with one side of one 'edge of said bands, spaced guide plates fixed to said stationary shaft and having apposite guiding faces normal to said stationary shaft, a drive shaft mounted on said sharpener carriage and extending radially outwardly with respect to said stationary shaft, an eccentric wheel eccentrically mounted on's aid drive shaft and engaged between said guiding faces for accomplishing reciprocation of said sleeve on said shaft by a mechanical relationship which is independent of said oscillatory movement 'of'said sharpener carriage about said stationary shaft, mcytor means carried bodily on said sharpener carriage and in driving association with said cylindrical abrading member for powering the rotation thereof'relative to said sharpener-carriage and in driving association with said drive shaft. p

10. The combination with-a base frame,,first'and second parallel, spaced-apart drum means rotatably mounted on said base frame, and endless slicing bands turning" on and reaching between. said first and second drum means, saidslicing bandseachhaving a cutting edge and said' slicing bands each having first and second reaches 'rocation in a given direction transversely 'of said'bands 'andforoscillation in'planes normal to said'direction, said given directionlbeing parallel to the axes' 'of'fsaid drum means, a cylindrical abrading member rotatably.

both of which extend from a position in contact with and tangent'to" said first drum means to a position in contact with; and tangent tosaid second drum means, and each 'of said first and second reache's having a twistof T degrees" therein,: of a sharpener carriage, means mounting said sharpener carriage on said base frame forrecipmounted on said sharpener carriagefor reciprocation and oscillation bodily therewith and for rotation relative thereto about an axis parallel to said given direction, said oscillatory motion of said abrading member bodily with said sharpener carriage accomplishing movement of said abrading member into and out of engagement with one side of one edge of said bands, linkage means for reciprocating said sharpener carriage, motor means in driving association with said cylindrical abrading member for powering the rotation thereof relative to said sharpener carriage and in driving association with said carriage-reciprocating linkage means for actuation thereof, yielding means normally biasing said sharpener carriage for oscillatory positioning of said abrading member out of contact with said blades, means limiting the angular velocity of said oscillatory movement of said abrading member into contact with said blades.

11. The combination with a base frame, first and second parallel, spaced-apart drum means rotatably mounted on said base frame, and endless slicing bands turning on and reaching between said first and second drum means, said slicing bands each having a cutting edge and said slicing bands each having first and second reaches both of which extend from a position in contact with and tangent to said first drum means to a position in contact with and tangent to said second drum means, and each of said first and second reaches having a twist of 180 degrees therein, of: a sharpener carriage, means mounting said sharpener carriage on said. base frame for reciprocation in a given direction transversely of said bands and for oscillation in planes normal to said direction, said given direction being parallel to the axes of said drum means, a cylindrical abrading member rotatably mounted on said sharpener carriage for recipro cation and oscillation bodily therewith and for rotation relative thereto about an axis parallel to said given direction, said oscillatory motion of said abrading member bodily with said sharpener carriage accomplishing movement of said abrading member into and out of engagement with one side of one edge of said. bands, linkage means for reciprocating said sharpener carriage, motor means in driving association with said cylindrical abrading member for powering the rotation thereof relative to said sharpener carriage and in driving association with said carriage-reciprocating linkage means for actuation thereof, means to move said abrading member into and out of contact with said blade.

No references cited. 

